GPS Surveying GPS how it works GPS Garmin

GPS Surveying • GPS -- how it works • GPS -- Garmin 12

Change windows The Garmin 12 GPS Use to scroll and for keying Confirm Get back to a point TURN ON

Trilateration and a th 4 for timing

First page up…. 4 important pieces of data The satillite It’s signal Nav Error

Once you have a fix Where you are Your elevation (flaky) Are you moving? Are you late?

Getting back to where you started Hit GOTO Pick a Waypoint Follow the arrow Monitor Speed Check Distance

GPS Accuracy Non-corrected 5 -30 m Beacon-corrected 1 m Radio-corrected cms Post-processed dm to m

Differential GPS for precision surveying of river terraces and alluvial fans

Crash Course in Surveying With an Auto Level:

: ( (: First thing first: Gotta level the it 1

1 TOP = DISTANCE BOTTOM = DISTANCE CENTER LINE - ELEVATION D

The Auto Level: The Stadia Rod Or Surveyor’s Staff The Instrument And Tripod = l (m) * 100 (m) 1

How to read the Stadia Rod: 11 meters on the dot Each Black Rectangle = 1 cm Same for Each white one 10. 8 meters on the dot So what’s this height? 10. 66 meters

What you’ll see through the eyepiece: Top Stadia = 10. 91 m Stadia Lines Height = 10. 85 m Bottom Stadia = 10. 79 m To Get Distance Away: 1) (Top - Bottom Stadia) = 0. 12 m 2) Multiply difference by 100: Distance = 12 meters

For your X-section, be sure to get any Major changes in slope Height Distance (X, Y) 1

How to collect the data: NOTE: When shooting features off your line, you will also need a bearing

Side-Scan Li. DAR: Geo. Archeology

“Project North” is at the white house, And that is BM 1 BM 4 Same scale as x-axis PN BM 3 BM 2 BM 1 Figure out appropriate scale for x: 1 box = 1 meter? 10 meters? You want your entire survey to fit!